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Commitments and Contingencies (Details 2) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2015	Jun. 30, 2015
Termination of Employment Agreement
Charges in connection with termination of employment agreement	$ 3.8
Non-cash expenses related to stock award compensation	$ 0.8
Accrued expenses and other current liabilities
Termination of Employment Agreement
Unpaid amout of cash portion of charges related to termination of employment agreement		$ 0.5
Other long-term liabilities
Termination of Employment Agreement
Unpaid amout of cash portion of charges related to termination of employment agreement		$ 1.9

X

- Definition

Represents the unpaid amount of cash severance expenses for special or contractual termination benefits provided to current employees terminated under a severance arrangement.

+ References

No definition available.

+ Details

Name:	int_SeveranceCostsCashAccrual
Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the amount of non-cash expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement.

+ References

No definition available.

+ Details

Name:	int_SeveranceCostsNonCash
Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees terminated under a severance arrangement.

+ References

No definition available.

+ Details

Name:	int_SeveranceTerminationCosts
Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: